VMS Help CC, Run-time functions, wcstoul  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Converts the initial portion of the wide-character string pointed
  to by nptr to an unsigned long integer.

  Syntax:

       #include <wchar.h>

       unsigned long int wcstoul(const wchar_t *nptr, wchar_t
       **endptr, int base);